I am sure I remember reading somewhere that adamantine weapons counted as +3 enhancement with regards to overcoming DR ( not that it was, it just counted as such)so it could pierce cold iron and silver ( and adamantine of course), but after rereading the relevant sections in the PRD I can't find proof of that.
Am I misremembering, or quoting from an older system?
no
+1 weapon count as magic
+3 count as silver and cold iron
+4 count as adamantine
+5 count as alignment
Adamantine weapons would overcome DR adamantine and hardness less than 20.
no
+1 weapon count as magic
+3 count as silver and cold iron
+4 count as adamantine
+5 count as alignment
+2 weapons can bypass Bludgeoning/Slashing/Piercing DR, right?
No.
+2 weapons can bypass Bludgeoning/Slashing/Piercing DR, right?no
+1 weapon count as magic
+3 count as silver and cold iron
+4 count as adamantine
+5 count as alignment
No magic enhancements lets you bypass those DR, same with DR/-.
Above is the link that defines what + overcomes what type of DR. You have to page down a bit.
-- david